Wilwood Red AERO4 Rear GT Rotor Kit with EPB Controls for Big Ford 2.36-Inch Axles, 14-Inch Two-Piece Brake Conversion

GT-slotted 14-inch rotor rings, aluminum hats and red AERO4 service calipers form this rear conversion. Separate red electric parking units supply static hold, while the Big Ford housing flange and 2.36-inch axle offset determine mechanical fit. Founded in 1977 by Bill Wood, Wilwood Engineering is based in Camarillo, California. Its disc brake systems and components serve motorsport, street-performance and specialized applications. The range includes calipers, rotors, master cylinders, valves, fittings and brake lines, chosen to suit the mounting and hydraulic requirements of the complete system.

Technical Details

• Manufacturer part number: 140-16173-R; supplied as one rear axle brake kit.
• Caliper finish and port: Red Powder Coat; hydraulic inlet 1/8-27 NPT.
• Rear axle interface: Big Ford housing flange; 2.36 in; 59.94 mm axle offset. Measure the installed assembly.
• Parking-brake package: Two separate electric parking calipers, control unit, switch with pigtail and universal wiring harness included; vehicle electrical connections require installation.
• Mechanical contents: Separate wheel hubs are not included; mounting hardware supplied; spindles not included.
• Minimum nominal wheel diameter: 18 in; 457.2 mm; full spoke/barrel clearance must be checked using the installation drawing.
• Rotor material and surface: Spec-37 Iron; vented; GT Slotted; surface finish Black Electro Coat.
• Cataloged rotor/hat mounting-hole pattern: 5 x 4.5 in; 5 x 114.3 mm; 5 x 4.75 in; 5 x 120.65 mm; 5 x 5 in; 5 x 127 mm bolt circle; cataloged stud-hole clearances 0.520 in; 13.21 mm. The existing hub or axle flange determines the vehicle wheel pattern and stud specification. These rotor/hat drillings do not convert that pattern.
• Supplied service pads: BP-20 compound; verify suitability for the intended operating conditions.
• Rotor dimensions: 14.00 in; 355.6 mm outside diameter; 1.10 in; 27.94 mm thick.
• Hydraulic installation: Hydraulic lines and fittings are separate and must be selected for the vehicle; master cylinder not included; brake booster not included.
• Rotor mounting hats: Aluminum; Black E-Coat; hat offset 1.625 inches. This is a hat dimension, not the axle offset.
• Hydraulic service calipers: AERO4; 4 pistons per caliper; Forged Aluminium body; radial mounting; Stainless pistons.

Fitment & Compatibility

This kit is selected for Big Ford geometry at 2.36 inches of axle offset. Wheel-stud pattern and register dimensions must match the supplied rotors or hats, and the parking motors and harness connectors need clearance throughout suspension travel. Compare the intended 18-inch or larger wheel with the installation drawing.

Use the fitment table below together with a measured axle check. A model name alone does not establish conversion compatibility; compare the flange, axle offset, register and chosen wheel pattern. For a 1990 Lincoln Town Car, identify the actual axle and confirm the specified interface; do not select this conversion from model and year alone.

Parking actuation is electric through a supplied controller, switch with pigtail, universal harness and two motor-driven calipers. The installer must provide suitable vehicle power/ground and ignition/accessory connections and check lead routing to DS1353. These additional calipers are for parking hold, not an emergency stop function.

With more than 20 years in parts, PMB Performance can help review the compatibility checks for this conversion. Include information about the axle, retained hubs and any changes from the original suspension.

Review the Installation instructions, Technical bulletin, EPB mounting and wiring instructions before selecting hardware or checking wheel clearance.

Manufacturer Warning

Applicable to brake pads only. WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.